diff --git a/src/main/integrity.ts b/src/main/integrity.ts
index 1c6d561..575f697 100644
--- a/src/main/integrity.ts
+++ b/src/main/integrity.ts
@@ -93,15 +93,11 @@ export function readHashManifest(packageDir: string): Map<string, ParsedHashEntr
       if (!parsed) {
         continue;
       }
-      const normalized: ParsedHashEntry = {
-        ...parsed,
-        algorithm: hit[1]
-      };
       const key = normalizeManifestKey(parsed.fileName);
       if (map.has(key)) {
         continue;
       }
-      map.set(key, normalized);
+      map.set(key, parsed);
     }
   }
   manifestCache.set(cacheKey, { at: Date.now(), entries: new Map(map) });
diff --git a/tests/integrity.test.ts b/tests/integrity.test.ts
index 29f46a0..7815c92 100644
--- a/tests/integrity.test.ts
+++ b/tests/integrity.test.ts
@@ -66,6 +66,21 @@ describe("integrity", () => {
     expect(parseHashLine("   ")).toBeNull();
   });
 
+  it("trusts the per-line algorithm over the file extension for a mislabeled manifest (.sfv holding md5 lines)", async () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-int-"));
+    tempDirs.push(dir);
+    const filePath = path.join(dir, "movie.bin");
+    fs.writeFileSync(filePath, Buffer.from("hello"));
+    fs.writeFileSync(path.join(dir, "checksums.sfv"), "5d41402abc4b2a76b9719d911017c592  movie.bin\n", "utf8");
+
+    const manifest = readHashManifest(dir);
+    expect(manifest.get("movie.bin")?.algorithm).toBe("md5");
+
+    const result = await validateFileAgainstManifest(filePath, dir);
+    expect(result.ok).toBe(true);
+    expect(result.message).toContain("MD5");
+  });
+
   it("keeps first hash entry when duplicate filename appears across manifests", () => {
     const dir = fs.mkdtempSync(path.join(os.tmpdir(), "rd-int-"));
     tempDirs.push(dir);